Hello, have just ordered a 151 that should be in Friday. I also ordered a Mac 7 channel amp and want to biamp my front l and r mains. From what I see this is done from the auxiliary 1-2 not the surrounds. I just want some input on how this is done. The dealer I'm purchasing this from is going to come down in a week or so to help out but I would like to have it done for the weekend. Thank you, Joe